Thinkpad 600E + alsa 0.9.0rc3/CVS, NULL pointer dereference

Thinkpad 600E + alsa 0.9.0rc3/CVS, NULL pointer dereference

[Zinx Verituse]

I was getting NULL pointer derefs with ALSA 0.9.0rc3 and CVS, and my
Thinkpad 600E..

After much trying of different versions, and a bit of poking in to
the source, I figured out it was because ALSA is not including
linux/autoconf.h at all, so it's not getting the CONFIG_PM define,
and thus not filling in some _much needed_ function pointers.

Simple [verified] solution is to #include "linux/autoconf.h"

I should note that I'm using Linux 2.4.x, and compiling ALSA
separately (is there any way to patch 2.4.x with ALSA?)

 -and now for something completely different-

I also noticed that ALSA requires the kernel's soundcore.o in
this setup, which does not create proper devfs devices (on my
desktop, with two sound cards, it tries to create lots and lots
of devices with the same name -- bad mojo.)

Editing alsa-kernel/core/oss/Makefile,
alsa-kernel/core/oss/sound_oss.c, and soft linking a few files
provides a workaround by using ALSA's soundcore.o, but it's
far from elegant..

Is there a reason I shouldn't be using ALSA's soundcore.o with
2.4.x?  and are there patches for Linux 2.4.x's soundcore.o to
make it create proper devfs names with ALSA?


-- 
Zinx Verituse


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Re: Thinkpad 600E + alsa 0.9.0rc3/CVS, NULL pointer dereference

[Takashi Iwai]

At Fri, 20 Sep 2002 15:45:56 -0500,
Zinx Verituse wrote:
> 
> I was getting NULL pointer derefs with ALSA 0.9.0rc3 and CVS, and my
> Thinkpad 600E..
> 
> After much trying of different versions, and a bit of poking in to
> the source, I figured out it was because ALSA is not including
> linux/autoconf.h at all, so it's not getting the CONFIG_PM define,
> and thus not filling in some _much needed_ function pointers.
> 
> Simple [verified] solution is to #include "linux/autoconf.h"

i think your kernel tree is broken.
usually, linux/autoconf.h is included from linux/config.h, which is
included by many other header files.
please check whether it's a real kernel tree.

> 
> I should note that I'm using Linux 2.4.x, and compiling ALSA
> separately (is there any way to patch 2.4.x with ALSA?)
> 
>  -and now for something completely different-
> 
> I also noticed that ALSA requires the kernel's soundcore.o in
> this setup, which does not create proper devfs devices (on my
> desktop, with two sound cards, it tries to create lots and lots
> of devices with the same name -- bad mojo.)
> 
> Editing alsa-kernel/core/oss/Makefile,
> alsa-kernel/core/oss/sound_oss.c, and soft linking a few files
> provides a workaround by using ALSA's soundcore.o, but it's
> far from elegant..
> 
> Is there a reason I shouldn't be using ALSA's soundcore.o with
> 2.4.x?  and are there patches for Linux 2.4.x's soundcore.o to
> make it create proper devfs names with ALSA?

you can replace soundcore.c with the one found in alsa-kernel.
this fixes the bug you mentioned.


Takashi


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